D. Cook, J. Oberling, T. Sadecki

After yesterday's SEI adjustment, we had a chance to revisit the IAS alignment of the ETM.  While Jason was going through his standard pre-measurement setup, I took the opportunity to (attempt to) close the ringheater as it had been passed over in previous entrances.  After loosening (or so I thought) the 4 8-32 screws that attach the RH to the Quad lower structure, I attempted to position the halves of the RH into their closed position.  While 3 of the 4 sides were loose enough to move, one side was mysteriously bound so that I could not move it into place.  After searching for interferences that would prevent me from moving it, and finding none, I examined the attachment points.  To my surprise, I found that the RH was not attached to the lower structure with the standard RH attachment blocks (D090438), but rather simply with nuts and washers (which appeared to be stainless on stainless).  Due to the the way in which the lower structure bolts together, I was unable to get a wrench onto the nut, and therefore had to rely mostly on friction with the assistance of allen key pressed against one of the flats of the hex nut.  So, unfortunately, I was unable to fully close the RH or sufficiently tighten any of the hardware attaching it (not a danger of loose hardware per se, just not very tight).  Not much we can to about it at this point either (maybe get a custom end wrench to fit through the 5mm gap and reach the nut) and not sure it's critical for the OAT anyhow. 

The ETM was found this morning with its MEDM master switch OFF, and in some unknown, unannounced state of testing.  After sorting its status, we got the damping loops running so we could get accurate IAS readings.  After several iterations of adjustment/tripping watchdogs/turning damping back on, we left the damping loops ON after satisfactory alignment was achieved. 

Either during our adjustment of pitch today, or some other event not yet identified, the yaw of the suspension was knocked back out of spec @ ~300urad.  Pitch is now in spec (I'll leave it to Jason to post the real numbers).